Increased energy harvesting and reduced accelerative load for backpacks via frequency tuning

The development of wearable electronics and sensors is constrained by the limited capacity of their batteries. Therefore, energy harvesting from human motion is explored to provide a promising embedded sustainable power supply for wearable devices. Herein, the principles, development, and applications of human motion excited energy harvesters are reviewed. The energy harvesters are classified based on the human motions with distinguished characteristics: center of mass motion (COM), joint motion, foot strike, and limb swing motion. According to the motion characteristics, the principles, features, and limitations of different energy harvesters are discussed, and the power generation performances are compared. Finally, various self-powered applications enabled by embedded energy harvesters are introduced, so as to show the great potential of embedded energy harvesting systems in boosting the development of the wearables.

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“…[ 67 ] Furthermore, by carefully designing the energy harvester, the user burden could be released to some extent. [ 61,62 ]…”

Section: Possible Self‐powered Applicationsmentioning

confidence: 99%

Recent Advances in Human Motion Excited Energy Harvesting Systems for Wearables

et al. 2020

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“…17 The ball-screw technique was used to convert the rotational motion of the EM motor into linear motion commonly found in linear actuators; by reversing the method, Kawamoto et al 12 have proposed a ball-screw EH as illustrated in Figure 28A. 106 Since the electric vehicle is expected to grow in the future, an EH-based suspension vibration is applied by translating linear vibration into rotation motion, which drives the generator input shaft. The EH operated with a 30-kg load and produced 6 to 10.6 W of power at a walking speed of 5.5 km/h.…”

Section: Mechanical Transmission: Gear/ Screwmentioning

confidence: 99%

“…The EH operated with a 30-kg load and produced 6 to 10.6 W of power at a walking speed of 5.5 km/h. 106 Since the electric vehicle is expected to grow in the future, an EH-based suspension vibration is applied by translating linear vibration into rotation motion, which drives the generator input shaft. The prototype ( Figure 28B) claimed an average power of 4.302 W at a frequency of 2.5 Hz and an amplitude of 7.5 mm, and the harvested energy was stored in a supercapacitor for the electric vehicle propulsion system.…”

Section: Mechanical Transmission: Gear/ Screwmentioning

confidence: 99%

Review of vibration-based energy harvesting technology: Mechanism and architectural approach

2018

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Summary Energy harvesting technologies are growing rapidly in recent years because of limitation by energy storage and wired power supply. Vibration energy is abundant in the atmosphere and has the potential to be harvested by different mechanisms, mainly through piezoelectric and electromagnetic means. Various architectural structures were also designed for several operating conditions, namely, resonance frequency and range thereof, acceleration, and energy extraction from several motions. The advantages and disadvantages were elaborated on, and improvements on ideas from current research were discussed in this review.

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“…Thus, traditional linear energy harvesters are usually limited to very narrow frequency ranges. In order to broaden the frequency bandwidth for effective energy harvesting, different techniques such as nonlinear energy harvesting [2,[18][19][20][21][22][23][24][25][26][27], array-harvester systems [28,29], and frequencytunable systems [30] have been developed so the harvester can accommodate a broader frequency range. Each technique has its own advantages and disadvantages.…”

Section: Introductionmentioning

confidence: 99%

Method for controlling vibration by exploiting piecewise-linear nonlinearity in energy harvesters

Tien

D’Souza

2020

Proc. R. Soc. A.

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Vibration energy is becoming a significant alternative solution for energy generation. Recently, a great deal of research has been conducted on how to harvest energy from vibration sources ranging from ocean waves to human motion to microsystems. In this paper, a theoretical model of a piecewise-linear (PWL) nonlinear vibration harvester that has potential applications in variety of fields is proposed and numerically investigated. This new technique enables automatic frequency tunability in the energy harvester by controlling the gap size in the PWL oscillator so that it is able to adapt to changes in excitations. To optimize the performance of the proposed system, a control method combining the response prediction, signal measurement and gap adjustment mechanism is proposed in this paper. This new energy harvester not only overcomes the limitation of traditional linear energy harvesters that can only provide the maximum power generation efficiency over a narrow frequency range but also improves the performance of current nonlinear energy harvesters that are not as efficient as linear energy harvesters at resonance. The proposed system is demonstrated in several case studies to illustrate its effectiveness for a number of different excitations.

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Increased energy harvesting and reduced accelerative load for backpacks via frequency tuning

Cited by 55 publications

References 18 publications

Recent Advances in Human Motion Excited Energy Harvesting Systems for Wearables

Recent Advances in Human Motion Excited Energy Harvesting Systems for Wearables

Review of vibration-based energy harvesting technology: Mechanism and architectural approach

Method for controlling vibration by exploiting piecewise-linear nonlinearity in energy harvesters

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